12. Patient taking medication specifically for treatment of ADHD symptoms (e.g., stimulants, atomoxetine, tricyclic antidepressants, bupropion, modafinil, etc) must be off stimulants for 2 weeks and off nonstimulant ADHD therapies for 3 weeks prior to the Baseline-1 Visit and must have returned to the baseline level of ADHD symptoms in the opinion of the investigator. Patients must not have evidence of a discontinuation or withdrawal reaction.